Technology Computer Aided Design

The website is intended to be a useful tool in order to link to all the recent publications concerned with Two-dimensional materials from the main journals in the field, i.e., (up to now) Physical Review Letters, Physical Review B, Applied Physics Letters, IEEE Transaction on Electron Devices, IEEE Electron Device Letters, IEEE Nanotechnology, Proceedings of IEEE, Scientific Reports, Nature Nanotechnology, ACS NANO and Nano Letters.

Sandia National Labs is looking for a TCAD software engineer who is a US citizen and is able to get a security clearance. From their description:

We have an immediate technical staff opening for a semiconductor device modeling software developer with expertise in scientific programming for high performance computing. The position emphasizes algorithm design and enhancement to extend the capabilities and increase the efficiency of our large scale, parallel, drift-diffusion solver, which is a C++/object oriented program. The successful candidate will be part of a team of computational scientists and semiconductor device physicists. Additionally, the position requires extensive interaction with experimental and theoretical physicists and research engineers working on characterizing radiation effects in microelectronic devices and the resulting changes to circuit performance.

I was aware that they had a software named Charon, which leveraged a commercial tool. It looks like they may be developing their own replacement. A quick google search revealed a mailing list for their git archives of the tool. It appears the tool has been in development at least since January 2012.

Fujitsu announced the simulation of a 3030 Atom Nano device here on January 14th, 2013. The simulation took 20 hours on their supercomputer to simulate the electrical properties of graphene and an insulating layer, using OpenMX Material Explorer.

Even more interesting is the news that OpenMX is an open source tool available from openmx-square.org under the terms of the GPL.

Sefer Bora Lişesivdin announced the release of Aestimo GPL 1D Schrödinger-Poisson solver last month. From his announcement on LinkedIn:

Aestimo Team is proud to release the version 0.9 of Aestimo 1D Self-consistent Schrödinger-Poisson Solver. This version includes many bugfixes, speed improvements, cython code additions, rewritten VBMAT-V part to use numpy better, merging conduction and valance band calculations and more. Code is heavily modified and stabilized.

where “PotentialEdgeFlux” was defined elsewhere in the script as “Permittivity * ElectricField”. The “kahan3” function is provided to add 3 numbers with additional precision.

For the electron and hole current densities, the Scharfetter-Gummel method is used to calculated the current along each edge connecting the nodes in the mesh. The Bernoulli function, B(x) and its derivative, dBdx(x) are provided in the DEVSIM interpreter

The purpose of this post is to describe some of the physics used in the previous example, and show how they are implemented within the DEVSIM software using a scripting interface. Once a set of physical equations has been implemented, it can be placed in modules that can be reused for other simulations.